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Platelet life span and apoptosis

  • Emma C. Josefsson
  • , Michael J. White
  • , Mark R. Dowling
  • , Benjamin T. Kile

Research output: Chapter in Book/Report/Conference proceedingChapter (Book)Otherpeer-review

Abstract

Like many nucleated mammalian cells, the life and death of the anucleate platelet is regulated by Bcl-2 family proteins. Platelets depend on Bcl-x L for survival. Bcl-x L maintains platelet viability by restraining the killer protein Bak. When Bak is unleashed, it triggers classical intrinsic apoptosis by causing mitochondrial damage. The latter leads to caspase activation and phosphatidylserine (PS) exposure. Platelet apoptosis can be blocked by caspase inhibitors, or by genetic deletion of Bak and its close relative Bax. Perturbations in the platelet apoptosis program lead to changes in platelet life span in vivo. Here, we describe methods to determine platelet life span, enumerate young platelets, and measure hallmarks of platelet apoptosis, such as PS exposure, caspase activation, and mitochondrial dysfunction.

Original languageEnglish
Title of host publicationPlatelets and Megakaryocytes: Volume 3, Additional Protocols and Perspectives
PublisherSpringer
Pages59-71
Number of pages13
Volume788
ISBN (Print)9781617793066
DOIs
Publication statusPublished - 2012
Externally publishedYes

Publication series

NameMethods in Molecular Biology
Volume788
ISSN (Print)10643745

Keywords

  • ABT-737
  • Apoptosis
  • Bak
  • Bcl-x
  • Caspase activity
  • Mitochondrial function
  • Phosphatidylserine
  • Platelet life span

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